I use a Surface Book regularly and my wife uses a Surface Pro 4. Both are great at what they are: portable computers. I had purchased my Book in part as an ex

I use a Surface Book regularly and my wife uses a Surface Pro 4. Both are great at what they are: portable computers. I had purchased my Book in part as an experiment to determine if a relatively small laptop could actually replace my desktop workstations. Unfortunately the answer to that question remains no. I had been expecting to find the 16 GB the most significant challenge. But before I could even face that, the truly important limitation in my use case is the Surface Book's inability to power two 4K monitors at 60 Hz—with or without its internal display enabled. Thus my Surface Book assumed its role as my mobile computer. When at home or at the office, I use a normal workstation. When on the go or in a meeting, I'll use my Surface Book. Upsides: * Amazing screens, aside from the glossy surface. The pixel density (267 DPI) is astonishing and the color accuracy is superb. * Touch screen / tablet mode. Can be a nice media consumption device, although these are devices for productivity first. * Reasonably good performance. I have no complaints for my use-case. Starts and runs fast. * Good battery life. Though, I don't tend to stress my portable computers with extremely long use away from an AC adapter. * Good keyboards. The Surface Book is obviously a little nicer here, but the Surface Pro 4's keyboard is surprisingly good for a tablet-cover form factor. * Good trackpads. * Good overall fit and finish. * Windows 10 looks nice and more or less works well enough. The downsides: * Did not deliver on the two 4K display promise that was featured several times in the 2015 unveiling video. (Caveat: The Surface Pro 4 can power two 4K displays at 60 Hz by attaching one to the dock and one to the tablet itself; meanwhile, the Surface Book—which has a discrete CPU, mind you—cannot.) * Magnesium coat/painting can wear down over time. I've had mine since launch and an underlying brighter chrome color is visible on some of the edges. * Initial launch was plagued by bad firmware and many software glitches. This has been resolved. * Glossy screen. Tablet computers from the early 2000s had matte screens making them easier to view in the real world where you have light. (Note: the Surface displays look amazing if you have a very dark office.) * Windows 10. Microsoft still needs to get serious about giving users privacy options. The latest effort they've made there has only confirmed some fears. Not allowing users to opt-out of the telemetry seems utterly hostile to users. * Limited to 16 GB. Would like to see a Surface Book Pro with at least 32 GB.